The article suggests a modelling tool for assessing competitiveness in hi-tech entreprises including aerospace industry. According to the primer approach in the theory of management of high-tech industries competitiveness, it is necessary to use the strategy for managing various factors, arising in the global and domestic markets according to the knowledge of their interdependencies. But the statistical approaches have the limited forecasting force when the sales of a certain type of hi-tech product are unique or no experience was obtained before. Nevertheless, the uncertainty can be seriously diminished if we use mathematical modelling based on well-calibrated functions which depend on our hypotheses and theoretical assumption. In the paper a possible principle of theoretical modelling the competitiveness is outlined. © 2019 Published under licence by IOP Publishing Ltd.